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Date:   Mon, 13 Dec 2021 13:56:29 +0800
From:   kernel test robot <lkp@...el.com>
To:     NeilBrown <neilb@...e.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mel Gorman <mgorman@...e.de>,
        Philipp Reisner <philipp.reisner@...bit.com>,
        Lars Ellenberg <lars.ellenberg@...bit.com>,
        Jan Kara <jack@...e.com>,
        Ryusuke Konishi <konishi.ryusuke@...il.com>,
        "Darrick J. Wong" <djwong@...nel.org>
Cc:     kbuild-all@...ts.01.org,
        Linux Memory Management List <linux-mm@...ck.org>,
        linux-xfs@...r.kernel.org, linux-ext4@...r.kernel.org
Subject: Re: [PATCH 2/2] Remove bdi_congested() and wb_congested() and
 related functions

Hi NeilBrown,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on hnaz-mm/master]
[also build test WARNING on axboe-block/for-next konis-nilfs2/upstream xfs-linux/for-next linus/master v5.16-rc5]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/NeilBrown/Remove-some-congested-tests/20211213-121653
base:   https://github.com/hnaz/linux-mm master
config: arc-randconfig-r015-20211213 (https://download.01.org/0day-ci/archive/20211213/202112131323.fj31o6EV-lkp@intel.com/config)
compiler: arceb-elf-gcc (GCC) 11.2.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/0day-ci/linux/commit/41802b6debbde3d5553a8067ba2deb2035e6da6e
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review NeilBrown/Remove-some-congested-tests/20211213-121653
        git checkout 41802b6debbde3d5553a8067ba2deb2035e6da6e
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=arc SHELL=/bin/bash fs/ext2/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

   fs/ext2/ialloc.c: In function 'ext2_preread_inode':
>> fs/ext2/ialloc.c:173:34: warning: variable 'bdi' set but not used [-Wunused-but-set-variable]
     173 |         struct backing_dev_info *bdi;
         |                                  ^~~


vim +/bdi +173 fs/ext2/ialloc.c

^1da177e4c3f41 Linus Torvalds    2005-04-16  154  
^1da177e4c3f41 Linus Torvalds    2005-04-16  155  /*
^1da177e4c3f41 Linus Torvalds    2005-04-16  156   * We perform asynchronous prereading of the new inode's inode block when
^1da177e4c3f41 Linus Torvalds    2005-04-16  157   * we create the inode, in the expectation that the inode will be written
^1da177e4c3f41 Linus Torvalds    2005-04-16  158   * back soon.  There are two reasons:
^1da177e4c3f41 Linus Torvalds    2005-04-16  159   *
^1da177e4c3f41 Linus Torvalds    2005-04-16  160   * - When creating a large number of files, the async prereads will be
^1da177e4c3f41 Linus Torvalds    2005-04-16  161   *   nicely merged into large reads
^1da177e4c3f41 Linus Torvalds    2005-04-16  162   * - When writing out a large number of inodes, we don't need to keep on
^1da177e4c3f41 Linus Torvalds    2005-04-16  163   *   stalling the writes while we read the inode block.
^1da177e4c3f41 Linus Torvalds    2005-04-16  164   *
^1da177e4c3f41 Linus Torvalds    2005-04-16  165   * FIXME: ext2_get_group_desc() needs to be simplified.
^1da177e4c3f41 Linus Torvalds    2005-04-16  166   */
^1da177e4c3f41 Linus Torvalds    2005-04-16  167  static void ext2_preread_inode(struct inode *inode)
^1da177e4c3f41 Linus Torvalds    2005-04-16  168  {
^1da177e4c3f41 Linus Torvalds    2005-04-16  169  	unsigned long block_group;
^1da177e4c3f41 Linus Torvalds    2005-04-16  170  	unsigned long offset;
^1da177e4c3f41 Linus Torvalds    2005-04-16  171  	unsigned long block;
^1da177e4c3f41 Linus Torvalds    2005-04-16  172  	struct ext2_group_desc * gdp;
^1da177e4c3f41 Linus Torvalds    2005-04-16 @173  	struct backing_dev_info *bdi;
^1da177e4c3f41 Linus Torvalds    2005-04-16  174  
de1414a654e66b Christoph Hellwig 2015-01-14  175  	bdi = inode_to_bdi(inode);
^1da177e4c3f41 Linus Torvalds    2005-04-16  176  
^1da177e4c3f41 Linus Torvalds    2005-04-16  177  	block_group = (inode->i_ino - 1) / EXT2_INODES_PER_GROUP(inode->i_sb);
ef2fb67989d30f Eric Sandeen      2007-10-16  178  	gdp = ext2_get_group_desc(inode->i_sb, block_group, NULL);
^1da177e4c3f41 Linus Torvalds    2005-04-16  179  	if (gdp == NULL)
^1da177e4c3f41 Linus Torvalds    2005-04-16  180  		return;
^1da177e4c3f41 Linus Torvalds    2005-04-16  181  
^1da177e4c3f41 Linus Torvalds    2005-04-16  182  	/*
^1da177e4c3f41 Linus Torvalds    2005-04-16  183  	 * Figure out the offset within the block group inode table
^1da177e4c3f41 Linus Torvalds    2005-04-16  184  	 */
^1da177e4c3f41 Linus Torvalds    2005-04-16  185  	offset = ((inode->i_ino - 1) % EXT2_INODES_PER_GROUP(inode->i_sb)) *
^1da177e4c3f41 Linus Torvalds    2005-04-16  186  				EXT2_INODE_SIZE(inode->i_sb);
^1da177e4c3f41 Linus Torvalds    2005-04-16  187  	block = le32_to_cpu(gdp->bg_inode_table) +
^1da177e4c3f41 Linus Torvalds    2005-04-16  188  				(offset >> EXT2_BLOCK_SIZE_BITS(inode->i_sb));
^1da177e4c3f41 Linus Torvalds    2005-04-16  189  	sb_breadahead(inode->i_sb, block);
^1da177e4c3f41 Linus Torvalds    2005-04-16  190  }
^1da177e4c3f41 Linus Torvalds    2005-04-16  191  

---
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